Question 1

Which of the following statements best explains why carbon is considered the backbone of life?

Accepted Answer

Carbon can form up to four covalent bonds, allowing for a diversity of stable structures.

Question 2

Which molecule below is considered organic according to the definition provided in the lecture?

Accepted Answer

CH$$_3CH$_3$$

Question 3

A dehydration reaction is crucial for building polymers from monomers. Which of the following best describes this process?

Accepted Answer

A water molecule is removed to form a covalent bond between monomers.

Question 4

Which functional group is responsible for the acidic properties of amino acids?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 5

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids contain only single bonds between carbon atoms, while unsaturated fatty acids contain one or more double bonds.

Question 6

Which of the following is NOT a function of carbohydrates in living organisms?

Accepted Answer

Catalyzing chemical reactions

Question 7

A mutation causes a single amino acid substitution in the primary structure of a protein. Which level(s) of protein structure could be affected?

Accepted Answer

Primary, secondary, tertiary, and quaternary structures

Question 8

Which of the following best explains why phospholipids form bilayers in water?

Accepted Answer

Their hydrophobic tails avoid water while their hydrophilic heads interact with water.

Question 9

Which of the following is a correct pairing of a carbohydrate polymer and its function?

Accepted Answer

Glycogen – energy storage in animals

Question 10

Which of the following best describes the role of ATP in the cell?

Accepted Answer

ATP provides energy for cellular processes.

Question 11

Which of the following statements about DNA and RNA is correct?

Accepted Answer

DNA is usually double-stranded, while RNA is usually single-stranded.

Question 12

Which of the following functional groups is found in all amino acids?

Accepted Answer

Amino group ($$-NH_2$) and carboxyl group (-$$COOH$$)

Question 13

A patient is diagnosed with sickle cell anemia. Which of the following best explains the molecular basis of this disease?

Accepted Answer

A single amino acid substitution in the primary structure of hemoglobin causes the protein to misfold.

Question 14

Which of the following best describes the process of hydrolysis?

Accepted Answer

A water molecule is added to break a polymer into monomers.

Question 15

Which of the following is a function of cholesterol in animal cells?

Accepted Answer

It stiffens cell membranes and is a precursor for steroid hormones.

Question 16

Which of the following best explains why proteins can perform so many different functions in living organisms?

Accepted Answer

Proteins are made of 20 different amino acids that can be arranged in countless sequences and shapes.

Question 17

Which of the following is a correct example of complementary base pairing in DNA?

Accepted Answer

Adenine pairs with thymine via two hydrogen bonds.

Question 18

Which of the following best describes the structure of a nucleotide?

Accepted Answer

A phosphate group, a five-carbon sugar, and a nitrogenous base

Question 19

Which of the following statements about lipids is correct?

Accepted Answer

Lipids are hydrophobic molecules that do not form polymers.

Question 20

Which of the following best explains why marathon runners often 'carb load' before a race?

Accepted Answer

Carbohydrates are used as a source of energy to make ATP during endurance activities.

Chemical Foundations of Life: Functional Groups and Biomolecules

Study Guide - Practice Questions